pub fn new_birthday_probability(n: u32) -> f64 {
    let mut result:f64 = 1.0;
    if n < 2{
        return 0.0;
    }
    for i in 1..n{
        result  = result * (365.0 - i as f64) / 365.0
    }
    ((1.0 - result) * 10000.0).round() / 10000.0
}
